Screw-plate.



O. G. RUSSELL.

' SCREW PLATE. APPLICATION FILED JUNE 21, 1912.

Patented May 6, 1913.

J a z m% I 'UNlTED srnrns ra rnn'r OFFICE.

CHARLES C. RUSSELL, 0F GREENFIELD, MASSACHUSETTS.

SCREW-PLATE.

Specification of Letters Patent.

Application filed June 21, 1912.

To all whom it may concern:

Be it known that 1, CHARLES C. RUSSELL, a citizen of the United States,residing at Greenfield, in the county of Franklin and State ofMassachusetts, have invented certain new and useful Improvements inScrew- Plates; and I do hereby declare the following to be a full,clear, and eXact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to improvements in screw plates, and it consists inthe constructions, combinations and arrangements herein described andclaimed.

An object of my invention is to provide an improved screw plate, inwhich the die members can be accurately adjusted and firmly locked inposition by the use of a screw driver, without the employment of specialwrenches or tools.

A further object of my invention is to provide an improved screw platehaving means for adjusting and holding screw-cutting die members togage, and for positively insuring the maintenance of said adjustable diemembers equidistant from the center of the collet. I

In the accompanying drawings forming a part of this application, and inwhich simi- .lar reference symbols indicate corresponding parts in theseveral views :Figure 1 is a face view, illustrating one embodiment ofmy invention; Fig. 2 is a section on the line 22 of Fig. 1; Fig. 3 is asection on the line 33 of Fig. 1.

Referring to the drawings, 1 indicates a collet provided with integralguides 2 for starting bolts true, and having undercut r'ccessesextending from its face for receiving adjustable die members 3; said diemembers being readily removed and inserted through an enlarged recess 4:intermediate of said undercut recesses, and being forced snugly intoplace against the undercut walls of such recess by means of screws 12,which may ongage the lower face of said die members or of liner platespositioned therebeneath. As shown in Figs. 1 and 3, a block 5 isremovably fitted in one of the undercut recesses Patented May 6,1913.

Serial No. 705,148.

for permitting convenient insertion and removal of the die members 3,but it is obvious that said block could be dispensed with by shorteningthe length of said die members, or by making the tapered screw head 11sufficiently large to provide a space behind said die members.

A pair of coaxial screws 6 are threaded through the collet 1, andprovided with tapered, or conical, ends 7 adapted to e11- gagecorrespondingly tapered faces 8 on the adjacent walls of the adjustabledie members 3, for accurately spacing said members to gage and insuringthe maintenance of said members equidistant from the center of thecollet. It will be evident that the same result could be efficientlyobtained by employing only one of the screws 6, if desired.

Locking, or adjusting, screws 9 are threaded in the collet and extendthrough recesses 10 in the adjacent walls of the collet and die members;said screws being provided with tapered heads 11 adapted to seat withinthe flaring, or tapered, upper ends of such recesses for wedging the diemembers against said gage screws 6. There the removal block 5 isemployed, said block constitutes, in effect, a part of the collet whenin position.

I have illustrated and described preferred and satisfactoryconstructions, but changes could he made within the spirit and scope ofmy invention.

I claim:-

1. The combination of a collet provided with an integral guide on itsfront face and with undercut recesses extending from its rear face,adjustable die members removably mounted in such recesses, andadjustable means accessible at the front face of said collet formaintaining said die members in snug engagement with the undercut wallsof such recesses.

2. The combination of a collet provided with an integral guide on itsfront face and with undercut recesses extending from its rear face,adjustable die members removably mounted in such recesses, adjustablemeans accessible at the front face of said collet for maintaining saiddie members in In testimony whereof, I aflix my signasnulg engagementWith the undercut Walls of ture, in presence of tWo Witnesses.

suc recesses, a common means engagin said die members for spacing thelatter 0% CHARLES RUSSELL gage, and tapered means between said colletWitnesses:

and die members for Wedging the latter MARION E. HANDFORT against saidspacing means. JOHN D. BOUKER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

1 Washington, D. G.

